WCDMA Multipath Searcher Mode Switching for UL Acquisition
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Solution Overview
Problem
Existing WCDMA receivers face challenges in optimizing the revisit rate of the multipath searcher to minimize the time to acquire an uplink transmission while managing CPU loading efficiently, especially in software-based implementations.
Innovation Solution
A dynamic adjustment of the multipath searcher revisit rate is implemented with two modes of operation: Acquisition Mode with a 100% revisit rate for initial acquisition and Steady-state Mode with a reduced revisit rate to optimize processing load, triggered by successful detection or a timer expiration, with adaptable revisit rates within configurable limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the multipath searcher operates with a 100% revisit rate continuously, then the acquisition time of uplink transmission is minimized, but the CPU loading during normal operation increases excessively
Solution Approach 1:
The patent applies dynamics by making the revisit rate adjustable and mode-switchable rather than fixed. The multipath searcher can operate in different modes (acquisition mode with 100% revisit rate, steady-state mode with reduced revisit rate) depending on the operational phase, allowing the system to adapt its behavior to minimize acquisition time when needed while reducing CPU loading during normal operation
Solution Approach 2:
The patent implements periodic action by using timers to control when the multipath searcher operates at full revisit rate versus reduced revisit rate. The system periodically switches between acquisition mode and steady-state mode based on timer expiration or successful detection events, creating a rhythmic pattern of high-activity and low-activity periods that balances performance and resource utilization
2Use of energy by moving object
If the multipath searcher operates with a reduced revisit rate to minimize CPU loading, then the processing load is optimized, but the time to acquire uplink transmission increases
Solution Approach 1:
The system dynamically adjusts the revisit rate based on operational mode. During acquisition mode, the revisit rate is set to 100% to ensure rapid acquisition, while during steady-state mode, it is reduced to optimize CPU loading. This dynamic adjustment resolves the contradiction by applying the appropriate revisit rate at the appropriate time
3Reliability
If the revisit rate is fixed at 100%, then acquisition performance is optimized, but resource utilization efficiency decreases
Solution Approach 1:
The system uses periodic action by implementing timer-based mode switching. The multipath searcher operates at full revisit rate periodically during acquisition mode to ensure reliable acquisition, then switches to reduced revisit rate during steady-state mode to improve resource utilization efficiency. This periodic alternation between high-performance and high-efficiency states resolves the contradiction
Data Source
AI summary
A method for dynamically adjusting the revisit rate of a rake receiver for an individual UE is disclosed, such that the time to initially acquire the UL transmission is optimized while the ongoing Central Processing Unit (CPU) loading during normal operation is minimized. The method may comprise operating a multipath searcher in a first mode of operation at a first time, the first mode being an acquisition mode, the multipath searcher operating with a revisit rate of 100 percent; and, operating the multipath searcher in a second mode of operation at a second time, the second mode being a steady-state mode and the multipath searcher operating with a revisit rate of less than 100 percent.